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PATAGONIAN EXPEDITIONS: ZOOLOGY. 



Pygocentrus Miiller & Troschel. 

 Type : Serrasalmo pivaya Cuvier. 

 Range: Orinoco to La Plata and Rio 

 das Velhas; not in coastwise streams 

 of southeastern Brazil. 

 I. Pygocentrus niger (Schomburgk). 



Habitat : Upper courses of all streams 

 of Guiana. 

 A2. Pygocentrus piray a (Cuvier). 



Serrasalmo paranha Agassiz ; ? Serra- 

 salmo nigricans Agassiz ; Pygocen- 

 trus bidorsalis Natterer. 

 Habitat: Guiana; Amazon to Rio das 

 Velhas and Paraguay. 

 3. Pygocentrus notatus (Liitken). 



Habitat : Venezuela. 

 A4. Pygocentrus scapularis (Giinther). 



Habitat : British Guiana to Para. 

 A5. Pygocentrus alius Gill. 



Habitat : Maraiion. 

 A %6. Pygocentrus natter eri ( Kner) . 



Habitat: La Plata Basin; ? Orinoco. 



7. Pygocentrus bilineatus Eigenmann. 



Habitat : North Western Guiana. 



8. Pygocentrus ternetzi Steindachner. 



Habitat: Rio Paraguay. 

 A9. Pygocentrus calmoni Steindachner. 



Habitat: Rio Para. 

 A 10. Pygocentrus striolatus Steindachner. 



Habitat: Para. 



Serrasalmo Lacepede. 

 Type : Salmo rhombeus Linnaeus. 

 Range: Orinoco to Guianas, south to 

 the Rio das Velhas and Paraguay 

 and Bolivia. 

 A 1. Serrasalmo elongatus Kner. 



Habitat : Rios Guapore and Huallaga. 

 A2. Serrasalmo gibbus Castelnau. 



Habitat : Araguay. 

 A3. Serrasalmo marginatus Valenciennes. 

 Serrasalmo humeralis Castelnau, not of 

 Cuvier & Valenciennes ; Serrasalmo 

 irritans Peters; Serrasalmo iridopsis 

 Ulrey (non Cope). 

 Habitat: La Plata Basin; Orinoco; 

 Amazons ; Rio das Velhas. 

 4. Serrasalmo brandtii Liitken. 



Habitat: Rio San Francisco. 

 As. Serrasalmo gymnogenys Giinther. 

 Habitat: Amazon and Paraguay. 

 A6. Serrasalmo iridopsis Cope. 



Habitat: Ambyiacu. 

 A7. Serrasalmo ccsopus Cope. 



Habitat: Solimoens and Maraiion. 

 A8. Serrasalmo maculatus Kner. 



Pygocentrus melanurus Heckel ; Pygo- 

 centrus nigricans Heckel. 

 Habitat : Amazons and Bolivia. 

 A9. Serrasalmo spilopleura Kner. 



? Serrasalmo aureus Agassiz ; Pygo- 

 centrus dulcis Heckel. 

 Habitat: Guianas to Paraguay and 

 Bolivia. 

 A 10. Serrasalmo humeralis Cuvier & Va- 

 lenciennes. 

 Habitat: Amazons and Paraguay. 

 All. Serrasalmo immaculatus Cope. 



Habitat: Peruvian Amazon. 

 All 2. Serrasalmo rhombeus (Linnaeus). 



Habitat: Guianas; Paraguay. 

 A13. Serrasalmo paracusis Steindachner. 

 Habitat: Rio Para. 



Subfamily Mylin^e 



Mylesinus Cuvier & Valenciennes. 



Type: Mylesinus schomburgkii Cuvier 



& Valenciennes. 

 Range that of the single species. 

 I. Mylesinus schomburgkii Cuvier & Valen- 

 ciennes. 



Habitat: Guiana; Rio Vaupes. 



Catoprion Miiller & Troschel. 



Type: Serrasalmo mento Cuvier. 

 Range that of the single species. 

 Al. Catoprion mento (Cuvier). 



